This paper presents a simple model to calculate the productivity of horizontal wells producing at constant flowing bottomhole pressure, Pwf, or constant rate from bounded reservoirs. We propose new, easy-to-use correlations to calculate the shape factor and partial penetration skin for both cases. The shape factor is calculated using an analytical solution of a fully penetrating well; and the partial penetration skin is calculated using a numerical solution. The correlations are developed using nonlinear regression (with R2 of 99%) of more than 800 numerical simulation runs for different reservoir aspect ratios, well locations and well penetration ratios. The productivity of wells producing at constant Pwf can be quite different from that of wells producing at constant rate. The models proposed in this paper are only approximate. In many cases they proved to be more accurate than other methods currently available in the industry. However, errors could be generated when the proposed models are used outside the range of applicability of the correlations.
Number of Pages
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.